Project MMO

Project MMO

Mods
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[1.21.1] Server crashes after trying to calculate PMMO XP (probably)

Dokturek991 opened this issue ยท 2 comments

commented

Describe the bug
The server crashed when a player joined after being offline for some time. He was in a group with his teammate, who was already online. As soon as we saw the message 'Player has joined the game,' the server started crashing.

We suspect this may be related to accumulated smelting/smithing XP (the one furnace gives), since they have two furnaces running almost nonstop.

The server stopped crashing after we removed those furnaces, but when the player tried to place them again, the entire server went down once more.

Versions:

  • Minecraft: 1.21.1
  • Loader: Neoforge 21.1.208
  • PMMO: 1.21.1-2.7.34

crash-2025-09-19_20.04.24-server.txt
crash-2025-09-19_20.08.50-server.txt
crash-2025-09-19_20.19.42-server.txt

commented

Furnaces award/cache their XP when the item finishes smelting, so the presence or absence of the block shouldn't affect anything related to XP. The issue I am going to have diagnosing this is how to reproduce it. That said, 75% of issues reported here usually stem from using Forgified Fabric, so I would start by removing that if you can. Since it looks like something is causing the config system to break, that'd be my first suspect.

commented

Yeah, I have no idea how to reproduce it.

As for Forgified Fabric - I don't think we have any use for it, but for some reason our server keeps crashing without it? We don't even have any fabric mods. It falls into category "If it works, don't touch it." I guess.